Not bulky like those old school vests. These O'Brien Flex V-Back Life Vests look good and are designed to keep you safe when you hit the water. With lots of freedom to move, this vest won't hinder your ability to show your true talents on the water. The Flex V-Back has a neoprene outer so you feel comfortable and a V-Back stretch panel which flexes with your movement so you don't feel constricted. To keep the fit feeling right, you'll have a zipper and 2 adjustable buckles so that each time you wear the O'Brien Flex V-Back Life Vests it feels secure and comfortable.